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Valve Kind Enough to Show Us How Left 4 Dead 2's Extended Mutation System Works

Modify campaign scripts to create exactly what you want out of Left 4 Dead 2.

There are times when game developers release their mod tools into the wild and say "Have fun!" to all those interested in playing around with them, and then proceed to not help anyone to understand how to use them. Not Valve, man. Not only are they releasing the Extended Mutation System, they've also laid out a tutorial blog on what you can do with it. What a bunch of nice folks.

The Extended Mutation System lets players tool around with the scripts of Left 4 Dead 2 campaigns by way rewriting some basic code. Previously, you could use the in-game Mutations system to make your own game modes with some simple tools, but with the EMS, you'll be able to change just about everything. Yes, that apparently includes adding a dude riding a balloon into your custom campaigns, as evidenced above. Not sure why you'd want one of those, but hey, there he is.